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Doha

Doha (population 370,000) is the capital of Qatar, located on the Persian Gulf. Major industries are oil and fishery.

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Quadratic formula

... to the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), ...